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\begin{equation}
\begin{aligned}
&amp;n (n-1) A_0 x^{n-2}+(n-1) (n-2) A_1 x^{n-3}+\cdots+2 A_{n-2}\\
&amp;\quad  \quad +b(n A_0 x^{n-1}+(n-1)A_1 x^{n-2}+\cdots+A_{n-1})\\
&amp;\quad  \quad  \quad+ c(A_0 x^n+A_1 x^{n-1}\cdots+A_{n-1} x+A_n)\\
&amp;\quad  \quad  \quad  \quad=a_0 x^n+a_1 x^{n-1}+\cdots+a_{n-1} x+a_n.
\end{aligned}\tag{3.6.8}
\end{equation}
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